Question answering (QA) studies systems that understand questions and the relevant context to provide answers.
Question forms include single document QA [1]}, multi-hop QA [2]}, conversational QA [3]}, and open domain QA [4]}. Questions about specific domains are asked in NewsQA [5]} and TechQA [6]}, and images are provided with the question in visual QA [7]}. Another interesting field of QA asks questions about source code
 [8]}.
